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61 lines
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HTML
61 lines
3.8 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 4//EN">
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<HTML><HEAD>
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<TITLE>Administration Reference</TITLE>
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<META HTTP-EQUIV="updated" CONTENT="Tue, 03 Oct 2000 16:18:29">
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<A NAME="Top_Of_Page"></A>
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<H1>Administration Reference</H1>
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<HR><P ALIGN="center"> <A HREF="../index.htm"><IMG SRC="../books.gif" BORDER="0" ALT="[Return to Library]"></A> <A HREF="auarf002.htm#ToC"><IMG SRC="../toc.gif" BORDER="0" ALT="[Contents]"></A> <A HREF="auarf046.htm"><IMG SRC="../prev.gif" BORDER="0" ALT="[Previous Topic]"></A> <A HREF="#Bot_Of_Page"><IMG SRC="../bot.gif" BORDER="0" ALT="[Bottom of Topic]"></A> <A HREF="auarf048.htm"><IMG SRC="../next.gif" BORDER="0" ALT="[Next Topic]"></A> <A HREF="auarf284.htm#HDRINDEX"><IMG SRC="../index.gif" BORDER="0" ALT="[Index]"></A> <P>
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<P>
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<H2><A NAME="HDRPRDBDB" HREF="auarf002.htm#ToC_45">prdb.DB0 and prdb.DBSYS1</A></H2>
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<P><STRONG>Purpose</STRONG>
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<A NAME="IDX4018"></A>
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<A NAME="IDX4019"></A>
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<A NAME="IDX4020"></A>
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<A NAME="IDX4021"></A>
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<A NAME="IDX4022"></A>
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<P>Contain the Protection Database and associated log
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<P><STRONG>Description</STRONG>
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<P>The <B>prdb.DB0</B> file contains the Protection Database, which
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maps AFS user, machine, and group names to their respective IDs (AFS UIDs and
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GIDs) and tracks group memberships. The Protection Server
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(<B>ptserver</B> process) uses the information in the database to help the
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File Server grant data access to authorized users.
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<P>The <B>prdb.DBSYS1</B> file is a log file in which the
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Protection Server logs each database operation before performing it.
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When an operation is interrupted, the Protection Server replays the log to
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complete the operation.
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<P>Both files are in binary format and reside in the <B>/usr/afs/db</B>
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directory on each of the cell's database server machines. When the
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Protection Server starts or restarts on a given machine, it establishes a
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connection with its peers and verifies that its copy of the database matches
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the copy on the other database server machines. If not, the Protection
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Servers call on AFS's distributed database technology, Ubik, to
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distribute to all of the machines the copy of the database with the highest
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version number.
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<P>Always use the commands in the <B>pts</B> suite to administer the
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Protection Database. It is advisable to create an archive copy of the
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database on a regular basis, using a tool such as the UNIX <B>tar</B>
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command.
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<P><STRONG>Related Information</STRONG>
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<P><A HREF="auarf209.htm#HDRPRDB_CHECK">prdb_check</A>
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<P><A HREF="auarf210.htm#HDRPTS_INTRO">pts</A>
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<P><A HREF="auarf227.htm#HDRPTSERVER">ptserver</A>
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<P>
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<HR><P ALIGN="center"> <A HREF="../index.htm"><IMG SRC="../books.gif" BORDER="0" ALT="[Return to Library]"></A> <A HREF="auarf002.htm#ToC"><IMG SRC="../toc.gif" BORDER="0" ALT="[Contents]"></A> <A HREF="auarf046.htm"><IMG SRC="../prev.gif" BORDER="0" ALT="[Previous Topic]"></A> <A HREF="#Top_Of_Page"><IMG SRC="../top.gif" BORDER="0" ALT="[Top of Topic]"></A> <A HREF="auarf048.htm"><IMG SRC="../next.gif" BORDER="0" ALT="[Next Topic]"></A> <A HREF="auarf284.htm#HDRINDEX"><IMG SRC="../index.gif" BORDER="0" ALT="[Index]"></A> <P>
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<br>© <A HREF="http://www.ibm.com/">IBM Corporation 2000.</A> All Rights Reserved
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